FORMER FBI Director James Comey has scorned the memo released by House Republicans after being declassified by US President Donald Trump, saying it doesn’t add up to much.

“That’s it?” Comey wrote on Twitter on Friday.

“Dishonest and misleading memo wrecked the House intel committee, destroyed trust with Intelligence Community, damaged relationship with FISA court, and inexcusably exposed classified investigation of an American citizen. For what?” Comey wrote, adding: “DOJ & FBI must keep doing their jobs.”

The tweet was the latest in a series from Comey this week as Trump clashed with the FBI over Friday’s release of the GOP-written memo.

On Thursday, Comey stood up for the bureau’s position against the document’s disclosure and took aim at unnamed people he calls “weasels and liars.”

“All should appreciate the FBI speaking up. I wish more of our leaders would,” Comey tweeted on Thursday night amid news that the FBI had lobbied the White House to block the release of a partisan memo on the Russia investigation.

Trump ordered the release of a controversial Republican-written memo that accuses the feds of illegally spying on a former campaign aide Carter Page — defying his own appointees in the FBI and Justice Department.

Soon afterwards, the Republican-led House Intelligence Committee released the document, which is based on classified information and alleges the FBI abused US government surveillance powers in its investigation into Russian election interference.

The memo states that Christopher Steele — a former MI-5 agent and Russia specialist — bore a personal grudge against Mr Trump, quoting Mr Steele as telling a Justice Department official that he “was desperate that Donald Trump not get elected and was passionate about him not being president.”

It states that the FBI abused the Foreign Intelligence Surveillance Act (FISA) by using claims in the Steele dossier about Mr Trump’s alleged ties to Russia.

The four-page memo was drafted by Republicans on the committee chaired by Devin Nunes of California.

He claims that the FBI and the Justice Department did not disclose to the Foreign Intelligence Surveillance Court (FISC) that the dossier had been paid for by Trump’s political opponents, including Hillary Clinton.

Nunes also writes that former Deputy FBI Director Andrew McCabe testified to the House Intelligence Committee that the FBI would not have gone to the FISC without the Steele dossier, although it doesn’t provide a quote of his testimony.

The memo also states that current Deputy Attorney General Rod Rosenstein, who’s overseeing special counsel Robert Mueller’s Russia investigation, applied for permission to continue surveillance of Mr Page at least once.

The FBI, Justice Department and Democrats furiously lobbied Mr Trump to stop the release.

They said it could harm national security and mislead the public.

The FBI said it had “grave concerns” about the memo’s accuracy, while Democrats said the memo is a blatant attempt by Mr Trump and House Republicans to discredit Mr Mueller’s investigation of Russian meddling in the 2016 election.

“A lot of people should be ashamed.” Mr Trump told reporters. “I think it’s a disgrace, what’s happening in our country.”

Republican Senator John McCain, who is fighting brain cancer, released a statement from his hospital bed blasting the release of the memo.

“Elected officials, including the president, must stop looking at this [Russia] investigation through the warped lens of politics and manufacturing partisan sideshows,” Sen. McCain said in a statement.

He added that “the latest attacks on the FBI and Department of Justice serve no American interests – no party’s, no president’s, only Putin’s.”

He was one of a number of Republicans including Senator Lindsey Graham and Jeff Flake or Arizona who said the memo should not be released.

“We run the risk of exposing some sensitive sources and methods,” Republican Charlie Dent told NBC News. “I read the memos … and I would rather not release them.”

The release of the memo has also been suggested to be a way to undermine Mr Rosenstein and potentially lead to his removal.

Asked if he still has confidence in Mr Rosenstein, Mr Trump told reporters, “you figure that one out.”

Shortly before Mr Trump declassified the memo he slammed the FBI and the Justice Department for having “politicised” their investigations and favouring Democrats, the Post reports.

“The top Leadership and Investigators of the FBI and the Justice Department have politicised the sacred investigative process in favour of Democrats and against Republicans — something which would have been unthinkable just a short time ago,” Mr Trump tweeted.

It appears Congress will release the memo later today, though House Intelligence Committee.

Chairman Devin Nunes and other Republicans have been eager to make it public despite objections from FBI agents.

In a statement released on Wednesday, the FBI made a rare statement, saying it was worried about the information the memo has omitted.

“The FBI was provided a limited opportunity to review this memo the day before the committee voted to release it,” the bureau said in a statement before the memo was made public. “As expressed during our initial review, we have grave concerns about material omissions of fact that fundamentally impact the memo’s accuracy.”

Mr Trump’s condemnation of top FBI and Justice officials comes as senior White House officials are worried that FBI Director Christopher Wray may quit now that the memo has been released.

Mr Trump also tweeted a quote from Judicial Watch President Tom Fitton, who described how Justice officials used their authority to spy on his campaign.

“‘You had Hillary Clinton and the Democratic Party try to hide the fact that they gave money to GPS Fusion to create a Dossier which was used by their allies in the Obama Administration to convince a Court misleadingly, by all accounts, to spy on the Trump Team.’ Tom Fitton, JW,’ ” Mr Trump wrote.

James Comey also tweeted about the FBI report, writing: “American history shows that, in the long run, weasels and liars never hold the field, so long as good people stand up. Not a lot of schools or streets named for Joe McCarthy.”

Despite Mr Trump’s accusations that the FBI report shows bias towards the Democrats, he seems to have forgotten that Mr Comey made a decision 11 days before the 2016 election to disclose that the FBI was reviewing more Hillary Clinton emails.

The FBI concluded days later that there was nothing additional of concern in the emails.

But the decision to re-open the topic of Mrs Clinton’s emails is considered by many to have contributed to her narrow loss against Mr Trump, including by Mrs Clinton herself.